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Acquisitions - (Summary of Intangible Assets) (Details) - Alpha - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 07, 2018
Business Acquisition [Line Items] |  |
Other intangible assets | $ 332,000 | $ 332,000
Customer relationships |  |
Business Acquisition [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |
Acquired intangible assets | $ 221,000 |
Technology |  |
Business Acquisition [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |
Acquired intangible assets | $ 55,000 |
Trademarks |  |
Business Acquisition [Line Items] |  |
Acquired indefinite-lived intangible assets | $ 56,000 |

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